<?php

/*
 * This file is part of SwiftMailer.
 * (c) 2004-2009 Chris Corbyn
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

/**
 * Changes some global preference settings in Swift Mailer.
 *
 * @package Swift
 * @author  Chris Corbyn
 */
class Swift_Preferences
{
	/** Singleton instance */
	private static $_instance = null;

	/** Constructor not to be used */
	private function __construct()
	{
	}

	/**
	 * Gets the instance of Preferences.
	 *
	 * @return Swift_Preferences
	 */
	public static function getInstance()
	{
		if (!isset(self::$_instance)) {
			self::$_instance = new self();
		}

		return self::$_instance;
	}

	/**
	 * Set the default charset used.
	 *
	 * @param string $charset
	 *
	 * @return Swift_Preferences
	 */
	public function setCharset($charset)
	{
		Swift_DependencyContainer::getInstance()
			->register('properties.charset')->asValue($charset);

		return $this;
	}

	/**
	 * Set the directory where temporary files can be saved.
	 *
	 * @param string $dir
	 *
	 * @return Swift_Preferences
	 */
	public function setTempDir($dir)
	{
		Swift_DependencyContainer::getInstance()
			->register('tempdir')->asValue($dir);

		return $this;
	}

	/**
	 * Set the type of cache to use (i.e. "disk" or "array").
	 *
	 * @param string $type
	 *
	 * @return Swift_Preferences
	 */
	public function setCacheType($type)
	{
		Swift_DependencyContainer::getInstance()
			->register('cache')->asAliasOf(sprintf('cache.%s', $type));

		return $this;
	}

	/**
	 * Set the QuotedPrintable dot escaper preference.
	 *
	 * @param boolean $dotEscape
	 *
	 * @return Swift_Preferences
	 */
	public function setQPDotEscape($dotEscape)
	{
		$dotEscape = !empty($dotEscape);
		Swift_DependencyContainer::getInstance()
			->register('mime.qpcontentencoder')
			->asNewInstanceOf('Swift_Mime_ContentEncoder_QpContentEncoder')
			->withDependencies(array('mime.charstream', 'mime.bytecanonicalizer'))
			->addConstructorValue($dotEscape);

		return $this;
	}
}
